1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com 1 i s series ultra low profile power resistors feature s ? heatsinkable ? low profile ? high power ? pulse handling capability ? non-flammable ? low inductances characteri stics tcr <250ppm (surface temp less than 150c) hot spot surface temperature 200c max. working voltage not to exceed 300v over-vlotage rating 5x rated power for up to for up to 1 second resistive element thick film derating element surface temp. at 100% to 0% power at 200c surface temp. power rating dependent on mounting and heat - sink thermal capacity maximum element temperature 365c pulsed load at full pulse power rating 1,000 cycles max. 1% r; (see fig 1) mounted on a 0.06c/w heatsink with forced air cooling, air tempera - ture 25c (ref ah32430 12" long) serie s specif ications power resistance rating range type (watts) ( ) tolerance is175 175 5 to 10k 10%, 20% is200 200 5 to 10k 10%, 20% IS250 250 5 to 10k 10%, 20% is270 270 5 to 10k 10%, 20% derating construction heat sinkable thick film % rated power resistor surface temp., oc 250 0 50 100 150 200 40 0 60 80 120 20 100 termination dielectric glass overcoat resistive glaze stainless steel uses ? braking resistors ? in-rush current limiter ? bleeder resistor ? power switching ? soft charging this product is designed for use with proper heatsinking. maximum base plate temperature of the resistor must be monitored and kept within specified limits to establish the power rating. best technique is to attach a thermocouple to the side of the base plate of the resistor. ? available with fast-on ter - minals or wire leads ? rugged construction ? ultra low profile thick-film on steel ? 175w to 270w sizes ? single fixing heatsink mountable
1-866-9-ohmite ? intl 1-847-258-0300 ? fax 1-847-574-7522 ? www.ohmite.com ? info@ohmite.com 2 ordering inform ation termin ation options heat sinkable thick film i s series ultra low profile power resistors is200c47rke tolerance k = 10% m = 20% resistance 3 digits 47r = 47 termination a = tinned pad b = soldered lead c = fast on terminal wattage 175 200 250 270 rohs compliant series insulated steel dimensions (in/mm) thickness: 0.04 in. / 0.9mm .1 type wattage l 0.1mm w 0.1mm ?d nom. wt. nom (oz/g) is175 175 1.94/49.30 1.41/35.90 0.13/3.20 0.44/12.60 is200 200 2.40/61.00 1.60/40.60 0.21/5.30 0.60/17.10 IS250 250 4.00/101.60 2.76/70.00 0.21/5.30 1.78/50.80 is270 270 4.80/122.00 2.76/70.00 0.21/5.30 2.12/60.70 w l d 10" 14awg 0.250" 0.032" 9mm 9mm solder pad only snag (96s) flying leads push-on connectors
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